title: The effect of lattice structure on dipole-exchange spin waves in ultrathin ferromagnetic films.
abstract: Calculations are reported relating to the dipole-exchange spin waves in ultrathin ferromagnetic films with different lattice structures such as simple cubic, body-centred cubic and face-centred cubic, using a microscopic, or Hamiltonian-based, theory. Both the short-range exchange and the long-range dipolar interactions are included in the Hamiltonian, together with an external magnetic field applied either parallel or perpendicular to the film surfaces. The use of phenomenological dipole-exchange boundary conditions, as in macroscopic theories, is avoided. Comparisons between our results and macroscopic theories generally give good agreement in a small wavevector limit. At larger wavevectors for the microscopic theory, it is found that the frequencies and the localization properties of the discrete spin waves show a sensitive dependence on the lattice structure.
authors.affiliation: Department of Physics and Astronomy, University of Western Ontario, London, ON, N6A 3K7, Canada.
authors.forename: T Hoa
authors.initials: TH
authors.lastname: Nguyen
authors.forename: M G
authors.initials: MG
authors.lastname: Cottam